Dry type developer for electrophotography

摘要

The present invention relates to the positively chargeable black toner particles which comprise binder resins, carbonblack as a main colorant, quaternary anmonium salt of the following formula (I) as a charge control agent and beta -form Cu-phthalocyanine as a stabilizing agent for chargeability of toner particles without being affected by the change of environmental conditions. <IMAGE> (I) Wherein R1 is C1-C8 alkyl or benzyl, R2 and R3 are each C1-C18 alkyl, R is C1-C118 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydrogen; (c) beta -form Cu-phthalocyanine; and (d) carbonblack. The present invention further relates to the two component dry-type developer composed by the improved above said positively chargeable toner particles and the carrier particles coated with silicone polylmers which have the strong durability without being changed to a supent carrier particles for a use of long time period.